If a679b is a five digit number that is divisible by 72, determine a and b.please its urgent.
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It divides by 72, so it has to be exactly divide both by 9 and 8 as they are the factors of 72.....
Divisibility of 8 should be last 3 term should be divide by 8.
So, ultimately 792 is the digit which divides by 8. So, b=2
Divisibility of 3 means sum of the digit of all numbers should be divisible by 3.
6+7+9+2+a=24 +a. So, a should be either 3, 6 or 9....
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